data-lake.ts: deal with setting non-flat data

src/libs/actions/data-lake.ts

@@ -1,5 +1,7 @@
 import { v4 as uuid } from 'uuid'
 
+import { flattenData } from '../data-lake/data-flattener'
+
 /**
  * A variable to be used on a Cockpit action
  * @param { string } id - The id of the variable
@@ -52,28 +54,47 @@ export const getDataLakeVariableData = (id: string): string | number | boolean |
   return dataLakeVariableData[id]
 }
 
-export const setDataLakeVariableData = (id: string, data: object | string | number | boolean): void => {
-  const newData = data
-  if (data === null) {
+export const setDataLakeVariableData = (
+  id: string,
+  data: object | string | number | boolean | Array<string | number>
+): void => {
+  if (data === null) return
+
+  // Handle already-flat primitive types first
+  if (typeof data === 'string' || typeof data === 'number') {
+    if (dataLakeVariableData[id] === undefined) {
+      createDataLakeVariable(new DataLakeVariable(id, id, typeof data))
+    }
+    dataLakeVariableData[id] = data
+    notifyDataLakeVariableListeners(id)
+    return
+  }
+
+  // Try to flatten complex data
+  const flattenedData = flattenData(data, (value, index) => {
+    setDataLakeVariableData(`${id}/${index}`, value)
+  })
+
+  if (!flattenedData) return
+
+  const { type, value } = flattenedData
+
+  // Only proceed with string or number types
+  if (type !== 'string' && type !== 'number') {
+    console.debug(`attempting to create a variable with type ${type}. Skipping`)
     return
   }
+
+  // Create variable if it doesn't exist
   if (dataLakeVariableData[id] === undefined) {
-    console.trace(`Cockpit action variable with id '${id}' does not exist. Creating it.`)
-    const type_of_variable = typeof data
-    if (type_of_variable === 'object') {
-      // TODO: support strings
-    }
-    if (type_of_variable !== 'string' && type_of_variable !== 'number') {
-      console.debug(`attempting to create a variable with type ${type_of_variable}. Skipping`)
-      return
-    }
-    createDataLakeVariable(new DataLakeVariable(id, id, typeof data))
+    createDataLakeVariable(new DataLakeVariable(id, id, type))
   }
-  if (newData === undefined || typeof newData === 'object') {
-    return
+
+  // Update the value and notify listeners
+  if (typeof value === 'string' || typeof value === 'number') {
+    dataLakeVariableData[id] = value
+    notifyDataLakeVariableListeners(id)
   }
-  dataLakeVariableData[id] = newData
-  notifyDataLakeVariableListeners(id)
 }
 
 export const deleteDataLakeVariable = (id: string): void => {

src/libs/data-lake/data-flattener.ts

@@ -0,0 +1,90 @@
+/**
+ * The result of flattening complex data structures into simple types
+ */
+interface FlattenedData {
+  /**
+   * The determined type of the flattened data
+   */
+  type: 'string' | 'number' | 'boolean' | 'object'
+  /**
+   * The resulting flattened value
+   */
+  value: string | number | boolean | object | Array<string | number>
+}
+
+/**
+ * Type guard to check if a value is an array of numbers
+ * @param {unknown[]} data The data to check
+ * @returns {data is number[]} True if the array contains numbers
+ */
+function isNumberArray(data: unknown[]): data is number[] {
+  return typeof data[0] === 'number'
+}
+
+/**
+ * Type guard to check if a value is an array of strings
+ * @param {unknown[]} data The data to check
+ * @returns {data is string[]} True if the array contains strings
+ */
+function isStringArray(data: unknown[]): data is string[] {
+  return typeof data[0] === 'string'
+}
+
+/**
+ * Flattens complex data structures into simple types that can be stored in the data lake
+ * @param {object | string | number | boolean | Array<string | number>} data The data to flatten
+ * @param {(value: number, index: string) => void} [onArrayElement] Callback for handling individual array elements
+ * @returns {FlattenedData | null} The flattened data structure or null if unable to flatten
+ */
+export function flattenData(
+  data: object | string | number | boolean | Array<string | number>,
+  onArrayElement?: (value: number, index: string) => void
+): FlattenedData | null {
+  const typeOfData = typeof data
+
+  if (typeOfData !== 'object') {
+    return {
+      type: typeOfData as 'string' | 'number' | 'boolean',
+      value: data,
+    }
+  }
+
+  // Handle arrays
+  if (Array.isArray(data)) {
+    if (data.length === 0) return null
+
+    if (isStringArray(data)) {
+      return {
+        type: 'string',
+        value: data.join(''),
+      }
+    }
+
+    if (isNumberArray(data) && onArrayElement) {
+      // Handle array of numbers by calling the callback for each element
+      data.forEach((value, index) => {
+        onArrayElement(value, index.toString())
+      })
+      return null
+    }
+  }
+
+  // Handle objects with special properties
+  const objData = data as Record<string, unknown>
+
+  if ('type' in objData && 'value' in objData) {
+    return {
+      type: typeof objData.type as 'string' | 'number' | 'boolean',
+      value: objData.value as string | number | boolean,
+    }
+  }
+
+  if ('bits' in objData) {
+    return {
+      type: typeof objData.bits as 'string' | 'number' | 'boolean',
+      value: objData.bits as string | number | boolean,
+    }
+  }
+
+  return null
+}